In the ChartWithLogging.vb file, go to line 344 and set a breakpoint. This is the code at line 344:
Try
'* Write the value to the property that came from the end of the PLCAddress... property name
Me.GetType().GetProperty(e.SubscriptionDetail.PropertyNameToSet).
SetValue(Me, Utilities.DynamicConverter(e.PLCComEventArgs.Values(0),
Me.GetType().GetProperty(e.SubscriptionDetail.PropertyNameToSet).PropertyType), Nothing)
Run the application and if it stops at the breakpoint, hover over PropertyNameToSet and see what the value is.